Tools
Free developer tools and personal finance calculators, all running in your browser.
Developer
JSON Formatter
Paste any JSON and instantly get a clean, indented, syntax-highlighted view.
JSON / CSV Converter
Convert JSON arrays into CSV tables or turn CSV rows into JSON objects directly in your browser.
Color Picker
Pick a color or paste a code and instantly convert it to HEX, RGB, HSL, HWB, and CMYK.
JWT Decoder
Paste any JWT and instantly decode the header, payload, and claims — no server, no secrets sent anywhere.
Base64 Encoder/Decoder
Encode plain text to Base64 or decode Base64 back to text directly in your browser.
HTML Preview
Paste HTML and render a sanitized live preview in a locked-down sandbox, entirely in your browser.
Markdown Preview
Paste any Markdown and see a live formatted preview — no account, runs entirely in your browser.
UUID Generator
Generate UUIDs for any version (v1–v8), copy them instantly, and keep a local history of past results.
QR Code Generator
Generate QR codes from any text or URL — customize size, colors, and error correction. Download as PNG.
Cron Expression Builder
Build 5-field cron schedules with presets, validation, and a plain-English explanation.
JSON to Schema Converter
Convert any JSON or JavaScript object into a TypeScript interface, Zod schema, JSON Schema, or YAML definition.
Pastel de Nata Ipsum
Lorem ipsum with a Portuguese soul — generate placeholder text and fake data records flavoured with pastéis, fado, and saudade.
Finance
Compound Interest Calculator
See how your investments grow over time with regular contributions and compound interest.
Savings Goal Planner
Find out how much you need to save each month to reach any savings target.
FIRE Number Calculator
Estimate your target portfolio and how long it may take to reach financial independence.
VAT Calculator
Calculate VAT and withheld tax on any invoice amount — pick a preset rate or enter a custom one.
Freelance Hourly Rate Calculator
Find out what hourly rate to charge as a freelancer based on your income goal and working hours.
Health
BMI Calculator
Calculate your Body Mass Index from weight and height and see which category you fall into.
BMR Calculator
Estimate your basal metabolic rate and see how many calories your body burns at rest each day.
Calorie Needs Calculator
Estimate maintenance calories and get a daily calorie target for cutting, maintaining, or gaining weight.
Macro Calculator
Split your daily calorie target into protein, carbs, and fat based on your diet style.
Calorie Deficit Calculator
Find out how long it will take to reach your target weight based on your daily calorie deficit or surplus.
Pastéis de Nata Burn Calculator
Convert your run into pastéis de nata — find out how many Portugal's favourite custard tarts you just earned.
Water Intake Calculator
Find out how much water you should drink each day based on your weight, activity level, and climate.